Aachen PK 2003 – wissenschaftliches Programm
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P: Plasmaphysik
P 16: Plasma Diagnostics
P 16.2: Vortrag
Donnerstag, 20. März 2003, 15:50–16:10, FO2
VUV-LIF measurements of rotationally and vibrationally excited hydrogen molecules — •Peter Vankan, Stephan Heil, Richard Engeln, and Daan Schram — Department of Applied Physics, Center for Plasma Physics and Radiation Technology, Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands
To understand the influence of H2rv in plasmas it is vital to have information on the density distribution over the different rovibrational levels. A setup has been built to detect rotationally and vibrationally excited hydrogen molecules. Laser Induced Fluorescence has been used in the vacuum ultra violet as diagnostic technique. Using the Stimulated Anti-Stokes Raman Scattering process laser radiation can be produced in the complete wavelength range from 200 nm down to 120 nm with a bandwidth of 0.15 cm−1 to state-selectively probe the hydrogen. A population distribution has been measured in the shock of a pure hydrogen plasma expansion. The higher rotational levels (J>5) show overpopulation compared to a Boltzmann distribution determined from the first five rotational levels. From the evolution of the population in the expansion it can be concluded that the plasma source is not the main origin of the H2rv